347 



Islands of Schistose Rock and Badlands 



Near Beaumont the "divide" (2,580 feet) is crossed, and 

 the highway descends to Redlands (1,350 feet), crossing 

 Yucaipe Valley. The mountain slope above Beaumont is no 

 longer the hard granite of the San Jacinto Mountains, but is 

 the soft friable Tertiary formation, with "islands" of granite 

 or metamorphosed schistose rocks rising above the general sur- 

 face. Crafton Hills, to the north of Yucaipe Valley, is an 

 "island" of schistose rocks, and a smaller "island" of similar 

 rocks is east of Redlands Heights. Redlands Heights, north and 

 east of San Timoteo Canyon, owes its "height" to elevation or 

 uplift of the soft and friable strata, which dip toward the north 

 from San Timoteo Canyon. 



South of San Timoteo Canyon are the Bad Lands, well 

 worth a trip down the Morena grade (from one mile west of 

 Beaumont) . The Bad Lands are thought to represent the east- 

 ern continuation of the fold or upbending of the rocks by 

 which the Bunker Hill Dike was formed. This uplift or fold 

 in the formations forms the divide between San Timoteo 

 Canyon and the San Jacinto Valley. The rocks are soft and 

 friable shales and sandstones, and so, being uplifted, are rapidly 

 eroded. San Timoteo Canyon is cut along the north side of 

 the Bad Lands belt. The Bad Lands topography is purely a 

 result of erosion in soft friable rocks. 



San Bernardino and the Rim-of -the -World 



San Bernardino (El. 1,073 feet) is located on the cienaga 

 formed on the depressed floor of the sunken basin at the foot 

 of the mountain escarpment of San Andreas fault. The basin 

 is filled with "wash" from the mountains, and this becomes 

 saturated with water, forming the cienaga. The Bunker Hill 

 Dike acts as a dam holding back the water. (See Fig. 75.) 



A side excursion from San Bernardino over "the rim-of- 

 the-world" highway to Arrowhead Lake (elevation 5,100 feet; 

 distance from San Bernardino 22 miles) and Bear Lake (El. 



